The present invention is a method and apparatus for providing an electrical substrate. The electrical substrate comprises a dielectric layer; and a first conductive layer attached to the dielectric layer, in which the first conductive layer has an elliptical cross-section. The electrical substrate may be used in a flexible circuit that connects the read/write head to electronic circuitry in a hard disk drive.
Legal claims defining the scope of protection, as filed with the USPTO.
1. An electrical substrate, comprising: a first conductive layer that has an elliptical cross-section; a second conductive layer; and, a dielectric layer attached to and located between said first and second conductive layers.
2. The substrate of claim 1 , wherein the first conductive layer is made from cooper.
3. The substrate of claim 1 , wherein the dielectric layer is polyimide.
4. The substrate of claim 1 , wherein the second conductive layer is made from steel.
5. A process for constructing an electrical substrate, comprising: attaching a first conductive layer onto a dielectric layer, said first conductive layer having an elliptical cross section; attaching a second conductive layer onto a second side of the dielectric layer.
6. A hard disk drive, comprising: a housing; a spin motor mounted to said housing; an actuator arm mounted to said spin motor, said actuator arm having a voice coil motor; a disk attached to said spin motor, said disk having at least one side; a read/write head mounted to said actuator arm for reading said at least one side of said disk; a flexible circuit attached to said read/write head and said voice coil motor, said flexible circuit comprising a dielectric layer; and a first conductive layer attached to said dielectric layer, said first conductive layer having an elliptical cross-section.
7. The hard disk drive of claim 6 , wherein the dielectric layer of the flexible circuit is a polyimide.
8. The hard disk drive of, claim 6 , wherein said flexible circuit further comprising a second conductive layer that is attached to the dielectric layer.
9. The hard disk drive of claim 8 , wherein the dielectric layer is between said first and said second conductive layers.
10. The hard disk drive of claim 8 , wherein the second conductive layer of the flexible circuit is made from steel.
11. The hard disk drive of claim 6 , wherein the first conductive layer of the flexible circuit is made from copper.
Cooperative Patent Classification codes for this invention. Click any code to explore related patents in that topic.
November 15, 2000
April 20, 2004
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